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feat: add self-closing-tags migration #12128

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Apr 16, 2024
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5 changes: 5 additions & 0 deletions .changeset/sixty-walls-act.md
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---
"svelte-migrate": minor
---

feat: add self-closing-tags migration
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Expand Up @@ -200,7 +200,7 @@
stageHeight: window.innerHeight,
colors: ['#ff3e00', '#40b3ff', '#676778']
}}
/>
></div>
{/if}

<style>
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Expand Up @@ -12,6 +12,6 @@
<p id="go-to-element">The browser scrolls to me</p>
</div>
<p id="abcde" style="height: 180vh; background-color: hotpink;">I take precedence</p>
<div />
<div></div>
<a href="/anchor-with-manual-scroll/anchor-afternavigate?x=y#go-to-element">reload me</a>
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Expand Up @@ -13,4 +13,4 @@
<p id="go-to-element">The browser scrolls to me</p>
</div>
<p id="abcde" style="height: 180vh; background-color: hotpink;">I take precedence</p>
<div />
<div></div>
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
<div style="height: 2000px; background: palegoldenrod" />
<div style="height: 2000px; background: palegoldenrod"></div>

<a id="one" href="/data-sveltekit/noscroll/target" data-sveltekit-noscroll>one</a>

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@@ -1,3 +1,3 @@
<div style="height: 2000px; background: palegoldenrod" />
<div style="height: 2000px; background: palegoldenrod"></div>

<h1>target</h1>
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@@ -1 +1 @@
<iframe title="Child content" src="./child" />
<iframe title="Child content" src="./child"></iframe>
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@@ -1,6 +1,6 @@
<div class="container">
<span> ^this is not the top of the screen</span>
<div class="spacer" />
<div class="spacer"></div>
</div>

<style>
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Expand Up @@ -12,4 +12,4 @@

<a href="/routing/b" data-sveltekit-reload>b</a>

<div class="hydrate-test" />
<div class="hydrate-test"></div>
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@@ -1,5 +1,5 @@
<h1>a</h1>

<div style="height: 200vh; background: teal" />
<div style="height: 200vh; background: teal"></div>

<a data-sveltekit-reload href="/scroll/cross-document/b">b</a>
56 changes: 56 additions & 0 deletions packages/migrate/migrations/self-closing-tags/index.js
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import colors from 'kleur';
import fs from 'node:fs';
import prompts from 'prompts';
import glob from 'tiny-glob/sync.js';
import { remove_self_closing_tags } from './migrate.js';
import { pathToFileURL } from 'node:url';
import { resolve } from 'import-meta-resolve';

export async function migrate() {
let compiler;
try {
compiler = await import_from_cwd('svelte/compiler');
} catch (e) {
console.log(colors.bold().red('❌ Could not find a local Svelte installation.'));
return;
}

console.log(
colors.bold().yellow('\nThis will update .svelte files inside the current directory\n')
);

const response = await prompts({
type: 'confirm',
name: 'value',
message: 'Continue?',
initial: false
});

if (!response.value) {
process.exit(1);
}

const files = glob('**/*.svelte')
.map((file) => file.replace(/\\/g, '/'))
.filter((file) => !file.includes('/node_modules/'));

for (const file of files) {
try {
const code = await remove_self_closing_tags(compiler, fs.readFileSync(file, 'utf-8'));
fs.writeFileSync(file, code);
} catch (e) {
// continue
}
}

console.log(colors.bold().green('✔ Your project has been updated'));
console.log(' If using Prettier, please upgrade to the latest prettier-plugin-svelte version');
}

/** @param {string} name */
async function import_from_cwd(name) {
const cwd = pathToFileURL(process.cwd()).href;
const url = await resolve(name, cwd + '/x.js');

return import(url);
}
191 changes: 191 additions & 0 deletions packages/migrate/migrations/self-closing-tags/migrate.js
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import MagicString from 'magic-string';
import { walk } from 'zimmerframe';

const VoidElements = [
'area',
'base',
'br',
'col',
'embed',
'hr',
'img',
'input',
'keygen',
'link',
'menuitem',
'meta',
'param',
'source',
'track',
'wbr'
];

const SVGElements = [
'altGlyph',
'altGlyphDef',
'altGlyphItem',
'animate',
'animateColor',
'animateMotion',
'animateTransform',
'circle',
'clipPath',
'color-profile',
'cursor',
'defs',
'desc',
'discard',
'ellipse',
'feBlend',
'feColorMatrix',
'feComponentTransfer',
'feComposite',
'feConvolveMatrix',
'feDiffuseLighting',
'feDisplacementMap',
'feDistantLight',
'feDropShadow',
'feFlood',
'feFuncA',
'feFuncB',
'feFuncG',
'feFuncR',
'feGaussianBlur',
'feImage',
'feMerge',
'feMergeNode',
'feMorphology',
'feOffset',
'fePointLight',
'feSpecularLighting',
'feSpotLight',
'feTile',
'feTurbulence',
'filter',
'font',
'font-face',
'font-face-format',
'font-face-name',
'font-face-src',
'font-face-uri',
'foreignObject',
'g',
'glyph',
'glyphRef',
'hatch',
'hatchpath',
'hkern',
'image',
'line',
'linearGradient',
'marker',
'mask',
'mesh',
'meshgradient',
'meshpatch',
'meshrow',
'metadata',
'missing-glyph',
'mpath',
'path',
'pattern',
'polygon',
'polyline',
'radialGradient',
'rect',
'set',
'solidcolor',
'stop',
'svg',
'switch',
'symbol',
'text',
'textPath',
'tref',
'tspan',
'unknown',
'use',
'view',
'vkern'
];

/**
* @param {{ preprocess: any, parse: any }} svelte_compiler
* @param {string} source
*/
export async function remove_self_closing_tags({ preprocess, parse }, source) {
const preprocessed = await preprocess(source, {
/** @param {{ content: string }} input */
script: ({ content }) => ({
code: content
.split('\n')
.map((line) => ' '.repeat(line.length))
.join('\n')
}),
/** @param {{ content: string }} input */
style: ({ content }) => ({
code: content
.split('\n')
.map((line) => ' '.repeat(line.length))
.join('\n')
})
});
const ast = parse(preprocessed.code);
const ms = new MagicString(source);
/** @type {Array<() => void>} */
const updates = [];
let is_foreign = false;
let is_custom_element = false;

walk(ast.html, null, {
_(node, { next, stop }) {
if (node.type === 'Options') {
const namespace = node.attributes.find(
/** @param {any} a */
(a) => a.type === 'Attribute' && a.name === 'namespace'
);
if (namespace?.value[0].data === 'foreign') {
is_foreign = true;
stop();
return;
}

is_custom_element = node.attributes.some(
/** @param {any} a */
(a) => a.type === 'Attribute' && (a.name === 'customElement' || a.name === 'tag')
);
}

if (node.type === 'Element' || node.type === 'Slot') {
const is_self_closing = source[node.end - 2] === '/';
if (
!is_self_closing ||
VoidElements.includes(node.name) ||
SVGElements.includes(node.name) ||
!/^[a-z0-9_-]+$/.test(node.name)
) {
return;
}

let start = node.end - 2;
if (source[start - 1] === ' ') {
start--;
}
updates.push(() => {
if (node.type === 'Element' || is_custom_element) {
ms.update(start, node.end, `></${node.name}>`);
}
});
}

next();
}
});

if (is_foreign) {
return source;
}

updates.forEach((update) => update());
return ms.toString();
}
31 changes: 31 additions & 0 deletions packages/migrate/migrations/self-closing-tags/migrate.spec.js
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import { assert, test } from 'vitest';
import * as compiler from 'svelte/compiler';
import { remove_self_closing_tags } from './migrate.js';

/** @type {Record<string, string>} */
const tests = {
'<div/>': '<div></div>',
'<div />': '<div></div>',
'<custom-element />': '<custom-element></custom-element>',
'<div class="foo"/>': '<div class="foo"></div>',
'<div class="foo" />': '<div class="foo"></div>',
'\t<div\n\t\tonclick={blah}\n\t/>': '\t<div\n\t\tonclick={blah}\n\t></div>',
'<foo-bar/>': '<foo-bar></foo-bar>',
'<link/>': '<link/>',
'<link />': '<link />',
'<svg><g /></svg>': '<svg><g /></svg>',
'<slot />': '<slot />',
'<svelte:options customElement="my-element" /><slot />':
'<svelte:options customElement="my-element" /><slot></slot>',
'<svelte:options namespace="foreign" /><foo />': '<svelte:options namespace="foreign" /><foo />',
'<script>console.log("<div />")</script>': '<script>console.log("<div />")</script>',
'<script lang="ts">let a: string = ""</script><div />':
'<script lang="ts">let a: string = ""</script><div></div>'
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ideally this would work on Svelte 5 codebases too (which means having svelte@next as a dependency, and using walk from either estree-walker or zimmerframe instead of svelte/compiler)

Suggested change
'<script lang="ts">let a: string = ""</script><div></div>'
'<script lang="ts">let a: string = ""</script><div></div>',
'{#snippet foo()}<div />{/snippet}': '{#snippet foo()}<div></div>{/snippet}'

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@dummdidumm dummdidumm Apr 15, 2024

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This should work in Svelte 5 code bases, too, because when you do npx .. aren't you storing the whole dependenies in a isolated folder somewhere on your computer? If not then yes we can switch to zimmerframe.

Oh wait I see what you mean. Mhhhhm how does npx work in general in these situations? Can it pick up dependencies from the environment it's run in? If so then we can do await import('svelte') and use that.

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Using the local Svelte installation now, tested it successfully on the Svelte 5 repo

};

for (const input in tests) {
test(input, async () => {
const output = tests[input];
assert.equal(await remove_self_closing_tags(compiler, input), output);
});
}
5 changes: 4 additions & 1 deletion packages/migrate/package.json
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Expand Up @@ -24,19 +24,22 @@
"!migrations/**/samples.md"
],
"dependencies": {
"import-meta-resolve": "^4.0.0",
"kleur": "^4.1.5",
"magic-string": "^0.30.5",
"prompts": "^2.4.2",
"semver": "^7.5.4",
"tiny-glob": "^0.2.9",
"ts-morph": "^22.0.0",
"typescript": "^5.3.3"
"typescript": "^5.3.3",
"zimmerframe": "^1.1.2"
},
"devDependencies": {
"@types/node": "^18.19.3",
"@types/prompts": "^2.4.9",
"@types/semver": "^7.5.6",
"prettier": "^3.1.1",
"svelte": "^4.2.10",
"vitest": "^1.5.0"
},
"scripts": {
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